efl src - mark fallthrough switch statements in 3rd party code

in code we importend that doesnt use eina we have warnings of
fallthroughs. all o them are commented to be fallthrough so add the
attribute there too to have fewer warnings.

src/bin/edje/epp/cpplib.c

@@ -3136,7 +3136,13 @@ get_directive_token(cpp_reader * pfile)
 	  case CPP_POP:
 	     if (!CPP_IS_MACRO_BUFFER(CPP_BUFFER(pfile)))
 		return token;
-	     /* ... else fall though ... */
+#ifndef __has_attribute
+# define __has_attribute(x) 0
+#endif
+#if __has_attribute(fallthrough)
+             __attribute__((fallthrough));
+#endif
+             /* ... else fall though ... */
 	  case CPP_HSPACE:
 	  case CPP_COMMENT:
 	     CPP_SET_WRITTEN(pfile, old_written);
@@ -4300,6 +4306,12 @@ skip_if_group(cpp_reader * pfile, int any)
 			  validate_else(pfile,
 					kt->type ==
 					T_ELSE ? "#else" : "#endif");
+#ifndef __has_attribute
+# define __has_attribute(x) 0
+#endif
+#if __has_attribute(fallthrough)
+                       __attribute__((fallthrough));
+#endif
                        /* this fall through is intened */
 		    case T_ELIF:
 		       if (pfile->if_stack == CPP_BUFFER(pfile)->if_stack)
@@ -6748,7 +6760,14 @@ cpp_handle_options(cpp_reader * pfile, int argc, char **argv)
 		    {
 		       opts->out_fname = "";
 		       break;
-		    }		/* else fall through into error */
+		    }
+#ifndef __has_attribute
+# define __has_attribute(x) 0
+#endif
+#if __has_attribute(fallthrough)
+                  __attribute__((fallthrough));
+#endif
+                  /* else fall through into error */
 	       default:
 		  return i;
 	       }

src/static_libs/http-parser/http_parser.c

@@ -2119,6 +2119,12 @@ http_parser_parse_url(const char *buf, size_t buflen, int is_connect,
       case s_req_server_with_at:
         found_at = 1;
 
+#ifndef __has_attribute
+# define __has_attribute(x) 0
+#endif
+#if __has_attribute(fallthrough)
+       __attribute__((fallthrough));
+#endif
       /* FALLTROUGH */
       case s_req_server:
         uf = UF_HOST;

src/static_libs/libunibreak/wordbreak.c

@@ -210,7 +210,13 @@ static void set_wordbreaks(
                 posLast = posCur;
                 break;
             }
-            /* Fall off */
+#ifndef __has_attribute
+# define __has_attribute(x) 0
+#endif
+#if __has_attribute(fallthrough)
+           __attribute__((fallthrough));
+#endif
+           /* Fall off */
 
         case WBP_Newline:
             /* WB3a,3b */
@@ -323,7 +329,13 @@ static void set_wordbreaks(
                 wbcSeqStart = wbcCur;
                 posLast = posCur;
             }
-            /* No break on purpose */
+#ifndef __has_attribute
+# define __has_attribute(x) 0
+#endif
+#if __has_attribute(fallthrough)
+           __attribute__((fallthrough));
+#endif
+           /* No break on purpose */
         case WBP_MidNumLet:
             if (((wbcLast == WBP_ALetter) ||
                         (wbcLast == WBP_Hebrew_Letter)) || /* WB6,7 */